I would like to see a dwarf impulse set. It could include a dwarf warrior and an anvil or something of use, allowing interaction with the other dwarf sets. I have honestly loved the castle impulse sets thus far and buy far more of those (money spent wise) than other sets from SAH.

Also, a minifig pack that includes knights, dwarves, trolls, etc, rather than every figure being from one faction would increase the appeal of those sets to me (it would also enable children to get a little of everything in each set). Doing that would bring the current minifig packs more in line with the old castle minifigs sets I bought tons of as a child.

I'm rather fond of the Impulse sets, the Castle releases in particular being some that i've bought multiples of, so i'd love to see more of these with different figs or factions.

Your latter suggestion's great too- it's something TLG used to do pretty often with most if not all themes. The closest on the market at the moment is the advent calendar, it's a pretty similar approach, but I'd love to see a more conventional return of the fig packs.

I'm in favor of the impulse sets also, but I find that the shelves of my stores local seem to focus on the $10 LEGO category. In particular they stock MANY of the Battle Pack and City sets that are in that price range, and they seem to sell very well as an inexpensive battle in the box.

I'd like to see more Battle Pack ideas from LEGO to exploit this sales bonanza such as the following ideas in the $10-12 category for Castle:

An impulse set idea I had for a theoretical Elves faction was the Elf Queen, her throne, and a "pet" unicorn. If nothing else, it would certainly be attractive to girls, and might get more of them into LEGO.